Cereal Chem 57:343 - 346.  |  VIEW ARTICLE
Amino Acid Analyses of the Proteins of the Major Histological Components of a High-Protein Rice.

J. H. Bradbury, J. G. Collins, and N. A. Pyliotis. Copyright 1980 by the American Association of Cereal Chemists, Inc. 

The major histological components (endosperm, embryo, and aleurone cells plus grain coat) of a high- protein rice (IR 480-5-9) were separated and examined by light and electron microscopy, and the various protein and amino acid analyses were determined. Thus the distribution of protein and of each amino acid in the histological components of the whole grain was obtained, and a satisfactory balance was made with analyses of the whole grain. The histological components that constitute the bran (embryo, aleurone cells, and grain coat) account for less than one-tenth of the weight of the whole grain of IR 480 yet contain about one-seventh of the total amount of protein and one-fifth of the first limiting amino acid, lysine. Nearly 50% more protein and about 20% more lysine were found in high-protein brown rice than in ordinary brown rice and also in high-protein milled (white) rice as compared with ordinary milled rice. The substantial gains in protein and lysine in high-protein milled rice far outweigh the slight reduction in its protein digestibility as compared with ordinary milled rice; consumption of the former variety would be advantageous.